<h2>Full example</h2>
<pre><code>#Spec: {
	kind: string

	name: {
		first:   !=""  // must be specified and non-empty
		middle?: !=""  // optional, but must be non-empty when specified
		last:    !=""
	}

	// The minimum must be strictly smaller than the maximum and vice versa.
	minimum?: int & &lt;maximum
	maximum?: int & >minimum
}

// A spec is of type #Spec
spec: #Spec
spec: {
	knid: "Homo Sapiens" // error, misspelled field

	name: first: "Jane"
	name: last:  "Doe"
}</code></pre>
